ChatGPT offers a permanent Free plan with basic access for all users....

https://penelopessmartdigests.talesignal.com/posts/can-i-request-a-chatgpt-plus-free-trial-from-support

ChatGPT offers a permanent Free plan with basic access for all users. Occasionally, targeted promotions provide free trials for the Plus plan, which may require a payment card and auto-renew into a paid subscription